Fixed #240 - refresh view after resuming FDroid activity.

The problem was that since the changes to implement tab swiping and
fragments, the process for refreshing the lists was changed. The
previous infrastructure for invalidating the result of
FDroidApp.getApps() is still useful, so we presume that the list of apps
is only going to take a few cycles to return, instead of several
seconds. If it has been invalidated, so be it, we will put up with
waiting the few seconds.

src/org/fdroid/fdroid/AppListManager.java

@@ -120,7 +120,7 @@ public class AppListManager {
         notifyLists();
         notifyActivity();
 
-        Log.d("FDroid", "Updated lists - " + allApps.size() + " allApps in total"
+        Log.d("FDroid", "Updated lists - " + allApps.size() + " in total"
                 + " (update took " + (System.currentTimeMillis() - startTime)
                 + " ms)");
     }

src/org/fdroid/fdroid/FDroid.java

@@ -19,6 +19,7 @@
 
 package org.fdroid.fdroid;
 
+import android.content.*;
 import android.content.res.Configuration;
 import android.support.v4.view.MenuItemCompat;
 import org.fdroid.fdroid.R;
@@ -26,8 +27,6 @@ import org.fdroid.fdroid.R;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.app.ProgressDialog;
-import android.content.DialogInterface;
-import android.content.Intent;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.net.Uri;
@@ -80,10 +79,6 @@ public class FDroid extends FragmentActivity {
         createViews();
         getTabManager().createTabs();
 
-        // Must be done *after* createViews, because it will involve a
-        // callback to update the tab label for the "update" tab. This
-        // will fail unless the tabs have actually been created.
-        repopulateViews();
 
         Intent i = getIntent();
         if (i.hasExtra("uri")) {
@@ -99,10 +94,16 @@ public class FDroid extends FragmentActivity {
     }
 
     @Override
-    protected void onStart() {
-        super.onStart();
+    protected void onResume() {
+        super.onResume();
+        repopulateViews();
     }
 
+    /**
+     * Must be done *after* createViews, because it will involve a
+     * callback to update the tab label for the "update" tab. This
+     * will fail unless the tabs have actually been created.
+     */
     protected void repopulateViews() {
         manager.repopulateLists();
     }